Java 27 and 26: runnable demos and captured output for every JEP, plus version lanes

Co-Authored-By: Claude Sonnet 5 <[email protected]> Claude-Session: https://claude.ai/code/session_01B38FGKKam5SCGgwgduVAh3
2026-09-21 15:08:50 +00:00
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+# Allocation workload, 1 CPU / 2 GB container, 400 batches x 50,000 objects, 3 runs per configuration (indicative, not a benchmark)
+# 'default' means nobody passed a collector flag.
+
+=== amazoncorretto:26 default run 1
+wall time         = 531 ms
+gc count / time   = 683 / 160 ms
+slowest batch     = 25 ms
+peak RSS          = 102 MB
+=== amazoncorretto:26 default run 2
+wall time         = 536 ms
+gc count / time   = 683 / 165 ms
+slowest batch     = 22 ms
+peak RSS          = 103 MB
+=== amazoncorretto:26 default run 3
+wall time         = 564 ms
+gc count / time   = 683 / 161 ms
+slowest batch     = 36 ms
+peak RSS          = 102 MB
+
+=== amazoncorretto:27 default run 1
+wall time         = 1052 ms
+gc count / time   = 26 / 204 ms
+slowest batch     = 26 ms
+peak RSS          = 492 MB
+=== amazoncorretto:27 default run 2
+wall time         = 974 ms
+gc count / time   = 26 / 192 ms
+slowest batch     = 25 ms
+peak RSS          = 492 MB
+=== amazoncorretto:27 default run 3
+wall time         = 1041 ms
+gc count / time   = 26 / 234 ms
+slowest batch     = 36 ms
+peak RSS          = 492 MB
+
+=== amazoncorretto:27 -XX:+UseSerialGC run 1
+wall time         = 528 ms
+gc count / time   = 668 / 147 ms
+slowest batch     = 23 ms
+peak RSS          = 98 MB
+=== amazoncorretto:27 -XX:+UseSerialGC run 2
+wall time         = 522 ms
+gc count / time   = 668 / 157 ms
+slowest batch     = 27 ms
+peak RSS          = 98 MB
+=== amazoncorretto:27 -XX:+UseSerialGC run 3
+wall time         = 588 ms
+gc count / time   = 668 / 157 ms
+slowest batch     = 48 ms
+peak RSS          = 97 MB
+